Connect 3/8" tubing to a 1/2" male pipe with the three eighths by half swivel coupling.

Connect 1/2" tubing to a 1/2" male pipe with the half by half swivel coupling.

Connect 3/4" tubing to a 3/4" threaded pipe with the three quarters by three quarters swivel coupling.

Connect 1/2" tubing to a 3/4" male pipe with the half by three quarters swivel coupling.